Parking brake



1954 c. B. REYNOLDS 2,670,063

PARKING BRAKE Filed March 26, 1952 n BRA K IN V EN TOR.

W A TTOR/VEX Patented Feb. 23, 1954 UNITED STATES PATENT OFFICE PARKINGBRAKE Charles B. Reynolds, Orange, Calif.

Application March 26, 1952, Serial No. 278,644

This invention relates generally to motor vehicles and is directedparticularly to improvements therein pertaining to the vehicles brakes.

An object of the present invention is to provide, in a manner ashereinafter set forth, a mechanism associated with the service brake ofa motor vehicle whereby such service brake will be automatically appliedand held in such position under prescribed conditions when the vehicleis at rest.

A further and more specific object of the in vention is to provide amechanism designed to be associated with the service brake of a motorve" hicle, by means of which such service brake will be automaticallyapplied and held applied upon and following the turning 01f of theignition whereby the motor vehicle engine is caused to stop.

A still further object of the invention is to provide, in a manner ashereinafter set forth, a fluid operated piston operatively coupled withthe motor vehicle service brake with a valve controlled means forconducting fluid under pressure to said piston, whereby the applicationof the pressure fluid to the piston will effect the application of theservice brake.

A still further object of the invention is to provide, in the manner ashereinafter set forth, mechanism of the above described characterwherein the transmission of the fluid under pressure to the brake pedaloperating piston becomes automatic with the turning off of the ignitionswitch of the engine.

Other objects and advantages of the invention will become apparent asthe description of the same proceeds and the invention will be bestunderstood from a consideration of the following detailed descriptiontaken in connection with the accompanying drawing forming a part of thespecification, with the understanding, however, that the invention isnot to be limited to the exact details of construction shown anddescribed since obvious modifications will occur to a person skilled inthe art.

In the drawing:

Figure 1 is a diagrammatic view illustrating the lay-out of the brakesystem of a motor vehicle and showing in association therewith themechanism constituting the present invention.

Figure 2 is a diagrammatic view of the mechanism per se, parts being insection and certain parts being on an exaggerated enlarged scale.

Figure 3 is a detailed view illustrating the connection between thefluid line control valve and the vehicle ignition switch unit.

1 Claim. (01. 192-3) Referring now more particularly to the drawingthere are illustrated in Figure 1 diagrammatically conventional parts ofa motor vehicle brake system with which the present invention isassociated, wherein the numeral l0 generally designates the mastercylinder which is operatively connected with the brake fluid lines I I,I2 and 53, the lines I2 and 13 leading from the main line H to theconventional brakes H! of the vehicle.

The numeral 16 designates the vehicle engine, shown in broken lines andthe numeral [8 designates the fan pulley.

Referring now more particularly to Figure 2 the main elements of thepresent invention are illustrated in association with the mastercylinder if! and the service brake 20.

In accordance with the present invention there is provided a suitableair compressor 22 which may be operatively coupled with the fan beltpulley I8 through the medium of the pulley 24 and belt 26, the latterbeing trained around the fan belt pulley. Leading from the compressor isthe fluid line 28 'by which air under pressure is conveyed to a suitabletank 30 having a pressure relief valve 32 by means of which the pressurewithin the tank may be maintained within safe bounds.

Associated with the brake pedal 20 is a. fluid cylinder 34 in which isthe fluid operated piston 36 having a rod 38 passing from an end of thecylinder to and coupled with the brake pedal 20 by suitable means suchas the clevis 40. The operating piston 36 is rearwardly of the brakepedal 20 so that when the piston is forced forwardly in the cylinder itwill move the brake pedal to brake applying position, forcing fluid fromthe master cylinder [0 into the fluid line I l for the purpose ofapplying brakes H! of the vehicle.

The numeral 42 designates a conventiona1 key operated ignition switch.No details of the construction of the ignition switch are shown sincethe same is of well known standard form.

Operatively coupled with the ignition switch lock 44, as indicated at46, is the rotary element 48 of a two-way valve which is generallydesignated 50, the rotary element being mounted within a suitablehousing 52.

The rotary element 48 has a single through passage 48a which, when inone position establishes a direct communication between a pipe 5|leading from the pressure tank 30 to an inlet 54 of the valve 50, andthe outlet 56 of the valve which is connected with one end of theconduit 58, the other end of which is connected with the fectly applyingit, as a result of which the mapiston cylinder 34 and communicates withthe chine, if parked on a hill, may coast down the interior thereof uponthe side of the piston 36 hill and cause considerable damage. With theopposite from the piston rod or stem 38. present invention as soon asthe ignition key is The shell 52 or housing of the valve 50 has 5 turnedto stop the engine the fluid under presthe two additional ports 60 and62 which are in sure in the tank 30 will take control of the brake linediametrically of the valve shell and at right system and apply and holdthe brakes applied angles to the line of communication between the untilthe ignition key is again inserted and ports 54 and 56. The port 62 isconnected by the turned to the position necessary for the starting pipe64 with theconduit 58 whilea the port 360 dfrthe engineawhereupon'it thef-fiuid "holding the opens'tothe atmosphere. brakesappliewwill beexhausted" and the brakes It is believed from the foregoing that theoperwill be released.

ation of the present invention will be readilyap- I claim:

parent. When the ignition key 44a is introduced zllnza braking systemfor motor vehicles, in-

into the lock 44 and turned for the purpose of cluding the service brakepedal of the vehicle turning on the ignition system '=of-'themotorveand"the-"master brake cylinder having its piston hicle the valveelement 48-.\will':be rotatedesowas connectedbtmandl forwardly thereof,a fluid presto establish communication between the ports sure cylinderhaving its piston connected to and 40 and 62. Thus the line leadingfromth-e' tank =rear-wardly of said pedal whereby movement of 30 to thecylinder 34 will be closed and fluid under the latter piston in theforward direction actut-pressulre :in theicylmder-tflnwillabe; permittedto :latesithe pedal :intoubrake"applyingyposition, an 1 reverseflow.to.the piperifikthrougmwhich; it.:will uainicompressonhaving..-.operative connection-with ppass to the exhaustportzfill.toatheatmosphere. athe -vehicler,;engine,ttza a tank i-supplied with:com- This willg permit. the; footl'braker 2B: -to=-'retum:.-to:pressed' air from: said: compressorna' conduit con- .itslnormal brake;released position. nectingzsaidrtanki with the secondinam-ed cylin-:-When the'enginesisxoperatedl the; pump; 22 will eder for1actuatingithepiston. thereof ,:-..a.: two-way ;build- -up;pressure. inthe tank #S Elal'Id WhBIl-fihti rotary-=1 valve'irr saidconduitzforucontrollingi the #vehicle is--.stopped--and ;the ignition:key turned :application of: theirfiuidapressureutoaand' its lexto: shutoff? theiignition-theva-lve :elementi-AB aw ill thaust' fromthewlattencylinder; va-lve having be turned to the position shown infull linesin 30 an operating stem, and a couplingiubetweensaid.Eigure-.2-. thusypermittingzfiuideunderlpressure to istem and theignition switchtof I the vehicle, pass through. the=;;pipesor--:con-duit-s 5| fa-ndw58 :wherelaythe valveis:turnedto its on and ofiinto the cylinder 34 and forcelwthe;piston 3.6'for z-positionsscorrespondingly with the turning "of wardly to shiiftzthe.iootebrakeatobrake: applied s sai'd sw itch"to' theu eversed positions thereof.position. 135 G-I-IARLES B. REYNGEDS.

From. the. foregoing itwil-l; be. readily ;a.-ppar.ent that when a motorvehiclewisequippedzwiththe lfiaferencfislmfiediin3511B filelf $1115 P e,apresentinvention.there will.heenordanget of the UNITED STATES PATENTSdriver- 0f. the vehicle. leaving the :machine; withe a :Name Dateaoutapplyvmgabrakelto holditlagamst accidental v :mevement. 1tfrequently happ ns motor $5: "gig-g? vehicle- -QpF2tlI01'. -Wl1'1.162111611318 machine-without 23283684 kschnennnj; Sept" 731943 1applying-lithe. hand-Jbrake or after :only imper-

